:root {
  color-scheme: light;
  --ink: #10233f;
  --muted: #60728b;
  --line: #d9e4ef;
  --paper: #f7fbff;
  --surface: rgba(255, 255, 255, 0.88);
  --blue: #2678b8;
  --blue-soft: #dceeff;
  --shadow: 0 24px 60px rgba(32, 83, 126, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 12% 8%, rgba(117, 194, 255, 0.28), transparent 32rem),
    linear-gradient(145deg, #eef8ff 0%, var(--paper) 46%, #f3f7fb 100%);
}

a { color: var(--blue); }

.shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 40px;
}

.hero { max-width: 760px; margin-bottom: 44px; }

.eyebrow, .meta {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.025em; }
h1 { margin: 0; font-size: clamp(38px, 7vw, 68px); }
h2 { margin: 0 0 12px; font-size: clamp(24px, 4vw, 34px); }
h3 { margin: 32px 0 8px; font-size: 20px; }

.lead { margin: 18px 0 0; color: var(--muted); font-size: 18px; }

.project-grid { display: grid; gap: 24px; }

.project-card, .document {
  border: 1px solid rgba(217, 228, 239, 0.9);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.project-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(220px, 0.7fr);
  gap: 28px;
  align-items: start;
  padding: 32px;
}

.project-card p { margin: 0; color: var(--muted); }

.project-mark {
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  border-radius: 23px;
  color: #fff;
  font-size: 30px;
  font-weight: 800;
  background: linear-gradient(145deg, #65b5ee, #2678b8);
  box-shadow: 0 14px 30px rgba(38, 120, 184, 0.25);
}

.link-list { display: grid; gap: 8px; }
.link-list a {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 11px 14px;
  border-radius: 13px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  background: #f2f8fd;
}
.link-list a:hover { background: var(--blue-soft); }

.document { padding: clamp(24px, 5vw, 56px); }
.document-header { padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.document-header h1 { font-size: clamp(32px, 6vw, 52px); }
.document-header p { margin: 12px 0 0; color: var(--muted); }
.document section { max-width: 760px; }
.document li + li { margin-top: 8px; }
.notice {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--blue);
  border-radius: 0 14px 14px 0;
  background: var(--blue-soft);
}
.back-link { display: inline-block; margin-bottom: 20px; font-weight: 700; text-decoration: none; }
.site-footer { margin-top: 30px; color: var(--muted); font-size: 13px; text-align: center; }

@media (max-width: 760px) {
  .shell { padding-top: 42px; }
  .project-card { grid-template-columns: 56px 1fr; padding: 24px; }
  .project-mark { width: 56px; height: 56px; border-radius: 18px; font-size: 24px; }
  .link-list { grid-column: 1 / -1; }
  .document { border-radius: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}